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兩個(gè)74HC595共用了，6 個(gè)IO 口，簡(jiǎn)單的定時(shí)器 時(shí)鐘，主要 是74HC595的控制。仿真：
單片機(jī)源碼：（位定義在 源文件）- #include<reg52.h>
- #include<intrins.h>
- typedef unsigned char uchar;
- typedef unsigned int uint;
- #define date P0
- #define count 50000
- #define TH_0 (65536-count)/256
- #define TL_0 (65536-count)%256
- uchar diss[8];
- uchar code distab[17] = {0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,
- 0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71,0x40};
- uint sec=0,min=0,hour=0;
- void delay(uint iii)
- {
- while(iii--);
- }
- void _74hc595_dula(uchar dat)
- {
- uchar i=0;
- sh_cp_dula=0;
- st_cp_dula=0;
- for(i=0;i<8;i++)
- {
- dula=dat>>7;
- dat=dat<<1;
- sh_cp_dula=1;
- _nop_();
- _nop_();
- sh_cp_dula=0;
- }
- st_cp_dula=1;
- _nop_();
- _nop_();
- st_cp_dula=0;
- }
- void _74hc595_wela(uchar dat)
- {
- uchar i=0;
- sh_cp_wela=0;
- st_cp_wela=0;
- for(i=0;i<8;i++)
- {
- wela=dat>>7;
- dat=dat<<1;
- sh_cp_wela=1;
- _nop_();
- _nop_();
- sh_cp_wela=0;
- }
- st_cp_wela=1;
- _nop_();
- _nop_();
- st_cp_wela=0;
- }
- void display()
- {
- uchar dat,i=0;
- for(dat=0xfe;dat!=0xff;dat=(dat<<1)|0x01) //1011 1111
- {
- _74hc595_dula(distab[diss[i++]]);
-
- _74hc595_wela(dat);
-
- if(i==8)i=0;
-
- delay(100);
- _74hc595_dula(0x00);
- delay(100);
-
- }
- }
- void disss()
- {
- diss[0]=hour/10;
- diss[1]=hour%10;
- diss[2]=16;
- diss[3]=min/10;
- diss[4]=min%10;
- diss[5]=16;
- diss[6]=sec/10;
- diss[7]=sec%10;
- }
- void timer0_init()
- {
- TMOD=0x01;
- EA=1;ET0=1;TR0=1;
- TH0=TH_0;TL0=TL_0;
- }
- void main()
- {
- timer0_init();
- while(1)
- {
- display();
- disss();
- }
- }
- void timer0() interrupt 1
- {
- static uchar j;
- TH0=TH_0;TL0=TL_0;
- if(++j==20)
- {
- j=0;
- sec++;
- if(sec==60)
- {
- sec=0;
- min++;
- if(min==60)
- {
- min=0;
- hour++;
- if(hour==24)
- {
- hour=0;
- }
- }
- }
- }
- }
74HC595數(shù)碼管.zip
(118.53 KB, 下載次數(shù): 162)
2019-1-13 21:08 上傳
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